When compiled with unsafemath enabled, "main" should enable SSE DAZ mode and
other fast SSE modes.
+
+//===---------------------------------------------------------------------===//
+
+cd Regression/CodeGen/X86
+llvm-as < setuge.ll | llc -march=x86 -mcpu=yonah -enable-x86-sse
+
+_cmp:
+ subl $4, %esp
+1) leal 20(%esp), %eax
+ movss 12(%esp), %xmm0
+1) leal 16(%esp), %ecx
+ ucomiss 8(%esp), %xmm0
+ cmovb %ecx, %eax
+2) movss (%eax), %xmm0
+2) movss %xmm0, (%esp)
+ flds (%esp)
+ addl $4, %esp
+ ret
+
+
+1) These LEA's should be adds. This is tricky because they are FrameIndex's
+ before prolog-epilog rewriting.
+2) We shouldn't load into XMM regs only to store it back.
+